EP0239469A1 - Kinematographisches Verfahren für die Aufnahme und Wiedergabe von Bildern und Tönen durch die Einleitung von Schmalbandkanälen in einem Videosignal - Google Patents

Kinematographisches Verfahren für die Aufnahme und Wiedergabe von Bildern und Tönen durch die Einleitung von Schmalbandkanälen in einem Videosignal Download PDF

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Publication number
EP0239469A1
EP0239469A1 EP87400581A EP87400581A EP0239469A1 EP 0239469 A1 EP0239469 A1 EP 0239469A1 EP 87400581 A EP87400581 A EP 87400581A EP 87400581 A EP87400581 A EP 87400581A EP 0239469 A1 EP0239469 A1 EP 0239469A1
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EP
European Patent Office
Prior art keywords
video signal
signals
recording
signal
encoder
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP87400581A
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English (en)
French (fr)
Inventor
Gérard Dumont
Othmar Tschan
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New Video Process Civile Ste
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New Video Process Civile Ste
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Publication date
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Publication of EP0239469A1 publication Critical patent/EP0239469A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/928—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the sound signal being pulse code modulated and recorded in time division multiplex with the modulated video signal

Definitions

  • the present invention relates to a cinematographic method of recording and playing back images and sounds on a recording medium, such as a cassette or a disc, by introducing narrow bandwidth channels into a video signal to be recorded. and by extraction after reading, as well as to a device for implementing this method.
  • the subject of the present invention is a method which makes it possible, in a simple manner, to introduce a large number of narrow bandwidth channels, such as audio channels, into a video signal to be recorded, in particular on a magnetic tape, and just as easily extract these channels when playing the video recording.
  • the present invention also relates to a device for implementing the method, device making it possible in particular to use any standard video cassette for recording, and to carry out the playback of this cassette on any video recorder. existing of the same standard and this, thanks to simple and inexpensive means.
  • the multiplexed signal is serialized, the serialized signal is substituted for certain lines of the signal video and these mixed signals are recorded in the usual way, then, when playing the recording, the reverse operations are carried out, so as to be able to select from n audio signals representing n different languages, com comments on the same images in one or more separate languages, at your choice of audio channels, to be available for playback simultaneously.
  • Digitization is preferably done by CVSDM (Continuously Variable Slope Delta Modulation).
  • the digitized signals are multiplexed and temporarily stored in memory, at the rate of acquisition.
  • the binary signals are extracted from the memory, coded, advantageously by Manchester coding, and recorded on the magnetic tape. From a temporal point of view, with respect to the composite video signal, these coded signals replace the video signal proper and occupy non-visualized lines of the TV frame which are selected in advance.
  • the device comprises an encoder and a decoder.
  • the encoder comprises n modulators, for example CYSDM, followed by a multiplexer, two memory areas, an encoder, such as a Manchester encoder, and a switching device. Everything operates under the control of sequential logic circuitry.
  • the decoder comprises a sequential logic circuit, a switching device, a decoder, such as a Manchester decoder, two memory areas, a demultiplexer and, if necessary, n digital-analog converters, such as CVSDM demodulators.
  • the encoder 1 shown in FIG. 1 has n inputs V 1 to V n receiving n audio signals, for example comments in n different languages relating to the same images.
  • This number n is for example equal to 8, but may be different from this value.
  • the encoder 1 also has an input 2 receiving a composite video signal corresponding, for the above example, to images to be accompanied by said comments.
  • the encoder 1 also has an output 3 which is connected to the recording input of a conventional video recorder (not shown).
  • Each of the channels V 1 to V n is connected by a corresponding filter F 1 to F n to a digitizer which is a modulator (CVSDM) Mod 1 to Mod n respectively.
  • Filters F 1 to F n are low-pass filters, the cut-off frequency of which is for example 3400 Hz.
  • the sampling or acquisition frequency of the modulator is then for example 32 kHz.
  • the outputs of modulators Mod 1 to Mod n are connected to a multiplexer 4. The output of this is connected to a buffer memory 5.
  • the memory 5 comprises two storage circuits M 1 , M 2 connected in parallel and activated alternately: when one is in write mode, the other is in read mode and this, for example, at the rate of the half-frames of the video signal.
  • the data extracted from the memory area are sent to a Manchester 6 type encoder.
  • the amplitude of the pulses delivered by the encoder is adjustable by means provided at its output and not shown.
  • the output of the adder 7 is connected to a high performance switching device.
  • the function of this element is to swap on the one hand the signal containing the code, on the other hand the composite video signal, and this in an order defined in advance.
  • Terminal 2 is also connected to a synchronization signal extraction circuit 9 making it possible to extract from the composite video signal, applied to terminal 2, the line and frame synchronization signals.
  • the circuit is connected to a “system management” control sequencer circuit 10.
  • the circuit develops, in a manner known per se, from the TV synchronization signals, the clock signals necessary for the modulators (Mod 1 to Mod n ) and for the multiplexer 4, and the memory read and write control signals (M 1 and M 2 ), as well as the control of the switching device 8.
  • This sub-assembly 10 also includes a parity detection circuit (TV frame) and a system for selecting TV lines. Thus the TV lines of the even or odd half-frames to be coded are selected in advance.
  • the decoder 11 represented in FIG. 2 has an input 12 receiving the signal available on the "Video output" terminal of a video recorder with which a magnetic tape recorded with the encoder of FIG. 1 is read.
  • the input of the decoder 12 is connected to a switching circuit 17.
  • the function thereof is to separate the TV lines carrying the video signal proper from the lines comprising only the code. The first are directed directly to the video output of the decoder 13, while the second are directed to the decoder proper by the intermediary of an amplifier 18.
  • the switching device 17 is controlled by logic circuitry called “system management" "16. This circuitry is identical to that in the decoder. It extracts the information it needs from the composite video signal by means of a TV sync separator circuit 15 which is itself connected to the input of the decoder 12.
  • the output of amplifier 18 is connected to a Manchester decoder 19 which delivers the data to be preserved in memory 20, as well as the clock pulses used for this function.
  • the memory comprises two areas M ′ 1 and M2 connected in parallel and controlled alternately like the memories M 1 and M 2 of the encoder.
  • the memory outputs are connected to a demultiplexer 21.
  • the n outputs of the latter (n being the same as for the encoder) are connected to n digital-analog converters which are here demodulators -CVSDM- 22.
  • the demodulators (Demod 1 to Demod n ) are respectively followed by n filters F ' 1 to F' n 23 on the outputs V ' 1 to V' n , from which the n starting audio channels 14 are collected.
  • the device described above operates in the following manner.
  • the different audio channels are sampled individually by CVSDM modulation.
  • the resulting digital signals are multiplexed (4).
  • the multiplexed signal is alternately stored in the memories M 1 . and M 2 .
  • the reason for this alternation is that data acquisition is done continuously, while their transfer to the magnetic tape must memories are made at the frequency of the half-frames of a TV scan (50 Hz). This implies that the capacity of the memories must be at least equal to the number of bits supplied by the CVSDM modulators during 20 ms.
  • the signals read alternately in M 1 and M 2 are coded (Self Clocking Code). A continuous component is added to the code, so that it does not disturb the video synchronization.
  • the encoder output signal is recorded on a VCR as if it were. it was a classic video signal.
  • the code replaces the video signal itself on the lines of the selected TV half-frames.
  • the signal generated by the TV lines comprising the code is directed to the decoder, where it will undergo the reverse processing of that of coding, namely: separation of the "data” and “clock” information ", temporary storage, demultiplexing, CVSDM demodulation and filtering.
  • the device according to the invention uses simple and inexpensive means, since these are current integrated circuits, does not require any modification of the video recorders used, because it is simply connected to the inputs and outputs of these VCRs, and allows the introduction of a large number of audio channels, for example up to 32, if digital telephone circuits are used.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
EP87400581A 1986-03-17 1987-03-17 Kinematographisches Verfahren für die Aufnahme und Wiedergabe von Bildern und Tönen durch die Einleitung von Schmalbandkanälen in einem Videosignal Withdrawn EP0239469A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8603768A FR2595894A1 (fr) 1986-03-17 1986-03-17 Procede et dispositif pour l'introduction de voies a bande passante etroite dans un signal video a enregistrer et l'extraction de ces voies apres lecture
FR8603768 1986-03-17

Publications (1)

Publication Number Publication Date
EP0239469A1 true EP0239469A1 (de) 1987-09-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400581A Withdrawn EP0239469A1 (de) 1986-03-17 1987-03-17 Kinematographisches Verfahren für die Aufnahme und Wiedergabe von Bildern und Tönen durch die Einleitung von Schmalbandkanälen in einem Videosignal

Country Status (2)

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EP (1) EP0239469A1 (de)
FR (1) FR2595894A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295154A (en) * 1978-08-04 1981-10-13 Nippon Telegraph, Telephone Public Corp. Digital video and audio file system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5975783A (ja) * 1982-10-23 1984-04-28 Pioneer Electronic Corp ビデオフォ−マット信号の記録再生方式

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295154A (en) * 1978-08-04 1981-10-13 Nippon Telegraph, Telephone Public Corp. Digital video and audio file system

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
FERNSEH- UND KINO-TECHNIK, vol. 37, no. 6, juin 193, pages 251-259, Berlin, DE; D. WESTERKAMP et al.: "Digitale Magnetbandaufzeichnung von Video- und Audio-Signalen auf einem Videocassettenrecorder" *
FERNSEH- UND KINO-TECHNIK, vol. 38, no. 7, juillet 1984, pages 281-286, Berlin, DE; J. HEITMANN: "Digitale Videoaufzeichnung; Grundlagen . Standardisierung . Entwicklung" *
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, vol. CE-30, no. 3, août 1984, pages 230-235, IEEE, New York, US; Y. MORIYAMA et al.: "An optical video disc system for retrieving digital data and reproducing still picture with sound" *
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, vol. CE-30, no. 4, novembre 1984, pages 581-591, IEEE, New York, US; H. MIYAGUCHI et al.: "PCM audio IC's for 8 mm video" *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 185 (E-262)[1622], 24 août 1984; & JP-A-59 75 783 (PIONEER K.K.) 28-04-1984; & US-A-4 602 295 (MORIYAMA et al.) (Date de publication: 22-07-1986) *

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FR2595894A1 (fr) 1987-09-18

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